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Adding support for TTF fonts (in progress)

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This commit is contained in:
raysan5 2015-01-18 10:58:04 +01:00
parent 5104567a24
commit 874dc89fca
3 changed files with 3263 additions and 2 deletions
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107
src/text.c
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@ -33,6 +33,12 @@
#include "rlgl.h" // raylib OpenGL abstraction layer to OpenGL 1.1, 3.3+ or ES2
#include "utils.h" // Required for function GetExtendion()
// Following libs will be used on LoadTTF()
#define STB_TRUETYPE_IMPLEMENTATION
#define STB_RECT_PACK_IMPLEMENTATION
#include "stb_rect_pack.h"
#include "stb_truetype.h"
//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
@ -64,6 +70,7 @@ static SpriteFont defaultFont; // Default font provided by raylib
static bool PixelIsMagenta(Color p); // Check if a pixel is magenta
static int ParseImageData(Color *imgDataPixel, int imgWidth, int imgHeight, Character **charSet); // Parse image pixel data to obtain character set measures
static SpriteFont LoadRBMF(const char *fileName); // Load a rBMF font file (raylib BitMap Font)
static SpriteFont LoadTTF(const char *fileName, int fontSize); // Generate a sprite font image from TTF data (font size required)
extern void LoadDefaultFont(void);
extern void UnloadDefaultFont(void);
@ -189,6 +196,7 @@ SpriteFont LoadSpriteFont(const char *fileName)
// Check file extension
if (strcmp(GetExtension(fileName),"rbmf") == 0) spriteFont = LoadRBMF(fileName);
else if (strcmp(GetExtension(fileName),"ttf") == 0) spriteFont = LoadTTF(fileName, 20);
else
{
Image image = LoadImage(fileName);
@ -567,11 +575,106 @@ static SpriteFont LoadRBMF(const char *fileName)
}
// Generate a sprite font from TTF data (font size required)
static SpriteFont GenerateFromTTF(const char *fileName, int fontSize)
static SpriteFont LoadTTF(const char *fileName, int fontSize)
{
SpriteFont font;
Image image;
image.width = 512;
image.height = 512;
image.pixels = (Color *)malloc(image.width*image.height*sizeof(Color));
unsigned char *ttfBuffer = (unsigned char *)malloc(1 << 25);
// TODO: Load TTF and generate bitmap font and chars data -> REVIEW!
stbtt_packedchar chardata[128]; // Num characters: 128 (?) -> REVIEW!
unsigned char *tempBitmap = (unsigned char *)malloc(image.width*image.height*sizeof(unsigned char)); // One channel bitmap returned!
// REFERENCE
/*
typedef struct
{
unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
float xoff,yoff,xadvance;
float xoff2,yoff2;
} stbtt_packedchar;
*/
stbtt_pack_context pc;
FILE *ttfFile = fopen(fileName, "rb");
fread(ttfBuffer, 1, 1<<25, ttfFile);
// TODO: Load TTF and generate bitmap font and chars data
stbtt_PackBegin(&pc, tempBitmap, image.width, image.height, 0, 1, NULL);
//stbtt_PackSetOversampling(&pc, 1, 1);
//stbtt_PackFontRange(&pc, ttfBuffer, 0, fontSize, 32, 95, chardata[0]+32);
stbtt_PackSetOversampling(&pc, 2, 2); // Better results
stbtt_PackFontRange(&pc, ttfBuffer, 0, fontSize, 32, 95, chardata + 32);
//stbtt_PackSetOversampling(&pc, 3, 1);
//stbtt_PackFontRange(&pc, ttfBuffer, 0, fontSize, 32, 95, chardata[2]+32);
stbtt_PackEnd(&pc);
free(ttfBuffer);
// Now we have image data in tempBitmap and chardata filled...
for (int i = 0; i < 512*512; i++)
{
image.pixels[i].r = tempBitmap[i];
image.pixels[i].g = tempBitmap[i];
image.pixels[i].b = tempBitmap[i];
image.pixels[i].a = 255;
}
free(tempBitmap);
// REFERENCE EXAMPLE
/*
//To draw, provide *text, posX, posY
//stbtt_aligned_quad letter;
//stbtt_GetPackedQuad(chardata[0], BITMAP_W, BITMAP_H, *text++, &posX, &posY, &letter, font ? 0 : integer_align);
void print(float x, float y, int fontNum, char *text)
{
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, font_tex);
glBegin(GL_QUADS);
while (*text) {
stbtt_aligned_quad q;
stbtt_GetPackedQuad(chardata[fontNum], BITMAP_W, BITMAP_H, *text++, &x, &y, &q, fontNum ? 0 : integer_align);
drawBoxTC(q.x0,q.y0,q.x1,q.y1, q.s0,q.t0,q.s1,q.t1);
}
glEnd();
}
print(100,160, 0, "This is a test");
*/
font.numChars = 95;
font.charSet = (Character *)malloc(font.numChars*sizeof(Character));
font.texture = LoadTextureFromImage(image, false);
//stbtt_aligned_quad letter;
//int x = 0, y = 0;
for (int i = 0; i < font.numChars; i++)
{
font.charSet[i].value = i + 32;
//stbtt_GetPackedQuad(chardata[0], 512, 512, i, &x, &y, &letter, 0);
font.charSet[i].x = chardata[i + 32].x0;
font.charSet[i].y = chardata[i + 32].y0;
font.charSet[i].w = chardata[i + 32].x1 - chardata[i + 32].x0;
font.charSet[i].h = chardata[i + 32].y1 - chardata[i + 32].y0;
}
UnloadImage(image);
return font;
}